Using Antennas to Extend and Enhance Wireless Connections

Wireless Networking

Using Antennas to Extend and Enhance Wireless Connections

4dBi Desktop Antenna, 5dBi Swivel Antenna, 9dBi Directional Antenna

Technical Note

This note was developed to provide practical information about the use of U.S. Robotics antenna accessories with 802.11b/802.11g wireless LAN products. The U.S. Robotics Family of Wireless Antennas described in the following sections is designed to connect to any wireless device that uses Reverse SMA (female) connectors.

Overview

A critical determinant to the successful implementation of a wireless LAN solution often revolves around providing appropriate antennas to support home and office environments. Wireless connection speeds and reliability are dependent on both distance and signal obstructions. These obstructions can be the walls, floors and ceilings of various constructions, as well as other less obvious items such as metal filing cabinets. In real-world use the distances you might attain will vary according to these conditions.

U.S. Robotics developed various antenna options to assist in optimizing wireless LAN solutions based on 802.11g and 802.11b wireless LAN standards. The maximum distance information provided for each antenna is based on engineering computations included in an appendix to this document.

Desktop Computer Wireless Enhancement

Antenna Solution - US Robotics 4dBi Desktop Antenna (USR5480)

The U.S. Robotics 4dBi desktop antenna is designed to attach to 802.11b and 802.11g wireless PCI cards via its reverse polarity SMA (female) connector.

Since PCI cards are normally installed into desktop PCs, the directly attached antenna must deliver a signal through the metal PC case and often compete with the "noisy" behind-the-desktop environment. The 4dBi Desktop Antenna allows for flexible placement on the desktop away from these potential interferences. As a result, the reception level of the wireless signal will improve significantly. The Desktop Antenna can also be mounted on a wall or window if desired, using included mounting tape.

With the 4dBi antenna, theoretically a distance of about 300 meters can be covered.

Specifications ? Gain: 4dBi ? Nominal impedance: 50 Ohms ? Frequency range: 2.4-2.5 GHz ? VSWR: ................
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